as you can see, the router or even the dhcp server wont assign IP addresses to any of the wireless enabled computers untill and unless it sees them and correspondingly responds to their respective DHCP requests. for this to happen, the wireless connection between the AP and the computers needs to be up and running before you try to logon to your domain. the sequence should be:
1) computers boot up and have their wireless cards enabled
2) computers request for IP address by broadcasting their MAC addresses to their AP
3) AP forwards the requests to the DHCP server.
4) DHCP server responds to the requests by assigning IP addresses to the corresponding computers
5) in the mean time the computers have booted up properly, and are ready for logging on to their domain by using their network client logon software (e.g novell client etc)
in your case, steps 1,2 and 3 is not being completed in that sequence. the computer boots up straight to the client screen, without even going through steps 1, 2 or 3.
your only work around in this case would be to boot up the computers as standalone workstations, enable the wireless connection in them so that they have an IP address assigned, then logoff (not reboot). now you can log back on into your domain using the client software
Picking pebbles on the shore of the networking ocean